Our distances are not driving distances, but are calculated as a 'straight-line' (or point-to-point) distance that stretches from Cos Jacket. A straight line distance ignores obstructions like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Cos Jacket) to Point B.
Our distance measurements begin at a specific point in Cos Jacket. The point that we are using is located at these GPS coordinates - Latitude: 64.8631, Longitude: -151.4139 [Map]. In this case, the coordinates for Cos Jacket have been provided by the Geographic Names Information System (GNIS).